Combine chicken,
celery, grapes, walnuts and onion in a large bowl. Mix well. Combine salt,
Worcestershire sauce, mayo and lemon juice in a small bowl and mix well. Add
mayo mixture to chicken mixture and mix well. Chill for about an hour. (If the
chicken was cold to begin with, you don’t need to chill the salad.) Divide
lettuce among four plates or bowls and top with chicken mixture. Or add the
lettuce to the chicken, celery, grapes, walnuts and onion, and then add the
dressing to the chicken and lettuce mixture and mix well.